Description
System Architecture & Operational Principle
The IC693ACC307 is a critical component in GE Series 90-30 and VersaMax PLC systems, designed to maintain signal integrity in distributed I/O architectures. It occupies the end position of an I/O bus expansion chain, connecting to the last I/O module via a 25-pin cable (e.g., IC693CBL302).
Operational Workflow:
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Signal Transmission: When the PLC CPU sends commands to I/O modules, signals travel along the I/O bus (a multi-drop serial network).
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Termination Function: The IC693ACC307 absorbs residual signal energy at the end of the bus, preventing signal reflection (which causes data corruption or communication timeouts).
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Compatibility: It works with all Series 90-30 I/O modules (e.g., digital inputs/outputs, analog modules) and VersaMax distributed I/O blocks, ensuring seamless integration with existing systems.
Architectural Advantage:
Unlike older termination methods (e.g., resistor packs), the IC693ACC307 is a plug-and-play solution that eliminates the need for manual resistor adjustments. Its DIN rail mounting allows for quick installation in control cabinets, reducing setup time and human error.
GE IC693ACC307
Core Technical Specifications
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Connector Type: 25-pin D-sub (male/female, depending on cable)
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Supported Cables: IC693CBL302 (straight-through), IC693CBL314 (right-angle)
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Maximum Cable Length: 15 meters (50 feet) per expansion segment
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Termination Resistance: Integrated 120Ω resistor (matched to I/O bus impedance)
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Mounting: DIN rail-compatible (35mm standard)
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Power Consumption: <15mA (powered by PLC I/O bus)
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Dimensions: 60mm (W) × 120mm (H) × 30mm (D) (2.36in × 4.72in × 1.18in)
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Weight: 0.13 lbs (59g)
Customer Value & Operational Benefits
Improved Signal Integrity
By terminating the I/O bus, the IC693ACC307 eliminates signal reflection— a common cause of communication errors in long bus chains. This ensures reliable data transfer between the PLC and field devices (e.g., sensors, actuators), reducing downtime and maintenance costs.
Simplified Installation & Maintenance
The plug-and-play design allows technicians to install the terminator in minutes, without needing to adjust resistors or modify the PLC configuration. The DIN rail mounting also makes it easy to relocate or replace the terminator during system upgrades.
Cost-Effective Reliability
The IC693ACC307 is a low-cost component that prevents expensive communication failures. For example, in a packaging line with 10 I/O modules, a missing terminator could cause intermittent faults—costing hours of downtime. The terminator eliminates this risk, ensuring consistent operation.
Scalability
It supports up to 15 meters of expansion cable per segment, allowing plants to extend their I/O systems without compromising signal quality. This is critical for facilities adding new equipment (e.g., robotic arms, conveyor belts) to existing lines.
Field Engineer’s Notes (From the Trenches)
Critical Installation Tip: Always install the IC693ACC307 at the end of the I/O bus chain—never in the middle. I once saw a site where a technician placed the terminator between two I/O modules, causing signal reflection and random communication timeouts. The fix was simple: move the terminator to the last module in the chain.Cable Compatibility: Use only GE-approved cables (IC693CBL302/IC693CBL314) with the IC693ACC307. Third-party cables may have incorrect pinouts, leading to signal loss or damage to the PLC.Labeling: Mark the terminator with a permanent marker (e.g., “End of I/O Bus”) to avoid confusion during future maintenance. This saves time when troubleshooting—you’ll know exactly where the terminator is located.Testing: After installation, use a multimeter to verify the termination resistance (120Ω) at the terminator’s connector. This ensures the resistor is functioning correctly and the bus is properly terminated.
Real-World Applications
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Packaging Machinery: A food packaging line uses the IC693ACC307 to terminate a 10-module I/O bus, ensuring reliable communication between the PLC and sensors (e.g., product detectors, label applicators). Without the terminator, the line would experience intermittent faults, slowing production.
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Material Handling Systems: A warehouse uses the IC693ACC307 to extend an I/O bus by 15 meters, connecting a new conveyor belt’s sensors to the PLC. The terminator prevents signal reflection, ensuring the conveyor operates smoothly.
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Food & Beverage Processing: A bottling plant uses the IC693ACC307 to terminate a 5-module I/O bus, connecting flow meters and valves to the PLC. The terminator ensures accurate data transfer, maintaining consistent product quality.
GE IC693ACC307
High-Frequency Troubleshooting FAQ
Q: What happens if I don’t use the IC693ACC307 terminator?
A: Without termination, signal reflection occurs at the end of the I/O bus, causing data corruption, communication timeouts, or complete system failure. Symptoms include random I/O faults, PLC error messages (e.g., “I/O bus timeout”), and inconsistent device operation.
Q: Can I use a third-party terminator instead of the GE IC693ACC307?
A: No—third-party terminators may not match the I/O bus impedance (120Ω) or have the correct connector pinout. Using a non-GE terminator can damage the PLC or cause unreliable communication. Always use genuine GE parts for compatibility.
Q: How do I test if the IC693ACC307 is working correctly?
A: Use a multimeter to measure the resistance between the terminator’s 25-pin connector pins (pin 1 and pin 25, for example). The reading should be 120Ω ±10%. If the resistance is outside this range, the terminator is faulty and needs replacement.
Q: Can I install multiple IC693ACC307 terminators in a single I/O bus?
A: No—only one terminator should be installed at the end of the I/O bus. Installing multiple terminators will cause signal attenuation (weakening) and communication errors.
Commercial Availability & Pricing
Please note: The listed price is not the actual final price. It is for reference only and is subject to appropriate negotiation based on current market conditions, quantity, and availability.
